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J. Robert Clark, Ph.D.
Chairman, Geologist/Geochemist
Dr. Clark is the sole owner of Skyline Assayers & Laboratories. Dr. Clark is the inventor of the Enzyme Leach®, and he co-developed the MAGIC organic extraction system that has been widely used in a variety of analytical disciplines.
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John “JP” Rosso
President
Known as “JP”, his career spans 40+ years in non-ferrous metals refining and manufacturing, working with a broad range of non-ferrous metals, including all (6) precious metals. Primary industries served have been mining, petroleum, and petrochemicals. Throughout his career , he has held simultaneous roles leading both domestic & international business development teams, in addition to laboratory, refining & production operations management.
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Meagan Sias
Laboratory Operations Manager
Meagan Sias has been employed in the mining industry since 2006. She has experience in management and quality control within several mining departments, including SX/EW, exploration, client services, and production samples. Meagan also has multiple years of experience with various laboratory instrumentation including ICP-OES and ICP-MS.
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Mike Jacobson
Chief Assayer, Arizona Assayer Emeritus, No. 52700
Mike has been with Skyline Labs since 2006. Graduate of the University of Arizona with a Bachelor of Science in Mathematics. Mike has over 15 years’ experience in laboratory operations, including precious metals fire assay technique, instrumental analysis by AAS, ICP-OES, ICP-MS, and analysis of Base Metals, Fluorine, Acid Consumption and Gypsum. Mike obtained his Registered Assayer Certification in 2011, and currently retains the status “Assayer Emeritus”.
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Bill Lehmbeck
Consultant, Geologist, Arizona Assayer Emeritus, No. 9425
Bill is a former co-owner of Skyline Labs. Bill was Manager of the Tucson operation from 1973 through 2000, and has served as consultant to the laboratory since 2001.